package com.example.demo1.itlianxi05;

import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Scanner;

public class StudentManage {
    public StudentManage() {
    }

    public static void main(String[] args) {
        ArrayList<Student> array = new ArrayList();

        while(true) {
            System.out.println("------欢迎来到学生管理系统-----");
            System.out.println("1.添加学生");
            System.out.println("2.删除学生");
            System.out.println("3.修改学生");
            System.out.println("4.查看所有学生");
            System.out.println("5.退出");
            System.out.println("请输入你的选择：");
            Scanner sc = new Scanner(System.in);
            switch (sc.nextLine()) {
                case "1":
                    addStudent(array);
                    break;
                case "2":
                    deleteStudent(array);
                    break;
                case "3":
                    updateStudent(array);
                    break;
                case "4":
                    findAllStudent(array);
                    break;
                case "5":
                    System.out.println("谢谢使用");
                    System.exit(0);
            }
        }
    }

    public static void addStudent(ArrayList<Student> array) {
        Scanner sc = new Scanner(System.in);

        while(true) {
            System.out.println("请输入学生学号");
            String sid = sc.nextLine();
            boolean flag = isUsed(array, sid);
            if (!flag) {
                System.out.println("请输入学生姓名");
                String name = sc.nextLine();
                System.out.println("请输入学生年龄");
                String age = sc.nextLine();
                System.out.println("请输入学生居住地");
                String address = sc.nextLine();
                Student s = new Student();
                s.setSid(sid);
                s.setName(name);
                s.setAge(age);
                s.setAddress(address);
                array.add(s);
                System.out.println("添加学生成功");
                return;
            }

            System.out.println("你输入的学号已经被使用，请重新输入");
        }
    }

    public static boolean isUsed(ArrayList<Student> array, String sid) {
        boolean flag = false;

        for(int i = 0; i < array.size(); ++i) {
            Student s = (Student)array.get(i);
            if (s.getSid().equals(sid)) {
                flag = true;
                break;
            }
        }

        return flag;
    }

    public static void findAllStudent(ArrayList<Student> array) {
        if (array.size() == 0) {
            System.out.println("信息为空，请先添加信息");
        } else {
            System.out.println("学号\t\t\t姓名\t\t年龄\t\t居住地");

            for(int i = 0; i < array.size(); ++i) {
                Student s = (Student)array.get(i);
                PrintStream var10000 = System.out;
                String var10001 = s.getSid();
                var10000.println(var10001 + "\t" + s.getName() + "\t" + s.getAge() + "\t" + s.getAddress());
            }

        }
    }

    public static void deleteStudent(ArrayList<Student> array) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要删除学生的学号");
        String sid = sc.nextLine();
        int index = -1;

        for(int i = 0; i < array.size(); ++i) {
            Student s = (Student)array.get(i);
            if (s.getSid().equals(sid)) {
                index = i;
                break;
            }
        }

        if (index == -1) {
            System.out.println("该学生不存在请重新输入");
        } else {
            array.remove(index);
        }

        System.out.println("删除学生成功");
    }

    public static void updateStudent(ArrayList<Student> array) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要修改学生的学号");
        String sid = sc.nextLine();
        System.out.println("请输入学生姓名");
        String name = sc.nextLine();
        System.out.println("请输入学生年龄");
        String age = sc.nextLine();
        System.out.println("请输入学生居住地");
        String address = sc.nextLine();
        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);

        for(int i = 0; i < array.size(); ++i) {
            Student student = (Student)array.get(i);
            if (student.getSid().equals(sid)) {
                array.set(i, s);
                break;
            }
        }

        System.out.println("修改成功");
    }
}
